The blast happened around 12:30 p.m. Monday while the pickup was parked near a sand volleyball court at a city park. Police found Guerrant badly injured outside the burning vehicle. He later died at a hospital.

Investigators have not determined if the detonation was accidental or intentional. The pipe bomb was described as 5 to 6 inches long.

No other explosive devices were found in the park, but police did find a container of black powder at Guerrant’s home.